DE102017108170A1 - Water extraction device and method for obtaining water - Google Patents

Abstract

The invention relates to a water extraction device (1) for recovering water from ambient air (4), comprising a sorption element for sorbing water from an input air stream (3) obtained from the ambient air (4) and for discharging water to a water extraction device (1) ) guided moist air flow (7), wherein the sorption element is arranged so that it can be traversed by the input air flow (3) and the moist air flow (7), with a heat supply means (8) for heating the moist air flow (7), before this sorption element flows through, so that the delivery of water to the moist air flow (7) is improved, and with a first condensation stage (12) having a condenser for recovering water from the moist air flow (7). According to the invention, the water extraction device (1) has a compressor (13) for compressing the moist air flow (7), which is arranged between the sorption element and the first condensation stage (12), so that from the damp air flow (7) through the first condensation stage (12) water can be won. The invention further relates to a method for obtaining water from ambient air (4), wherein according to the invention a moist air flow (7) is compressed before water is obtained from the moist air flow (7) in a first condensation step (25).

Description

The invention relates to a water extraction device for recovering water from an inlet air flow, comprising a sorption element for sorbing water from the inlet air flow and for delivering water to a wet air flow passed through the water extraction device, the sorption element being arranged to be separated from the inlet air flow and the water flow device Wet air flow can be flowed through, with a heat supply device for heating the moist air flow before it flows through the sorption, so that the delivery of water is improved to the moist air flow, and with a first condensation stage having a condenser for recovering water from the moist air flow.

Devices and methods for recovering water from an input air stream usually obtained from the ambient air are known in the art. Thus, the document discloses US 7,251,945 B2 a water extraction device with a sorption wheel. A portion of the sorption wheel is supplied with ambient air. By an adsorption process, water from the ambient air is adsorbed in the relevant section of the sorption wheel. The sorption wheel rotates so that the water present on the sorption wheel by the adsorption process is introduced into an air stream, which then flows through the water-enriched section of the sorption wheel separately from the ambient air. The air stream is previously heated by supplying warm exhaust air to the water extraction device. The heated air stream flows through the sorption wheel and removes this water. Subsequently, the water is recovered by the condenser from the damp air flow.

This water extraction device has the disadvantage that a recording of water through the condenser can not take place until the temperature of the air flow falls below a dew point temperature. The dew point temperature refers to that temperature of an air mixture below which water from the air mixture fogs on surfaces. In order to be able to separate the water from the airflow with the condenser, the warm airflow has to be cooled down, which, however, requires a great deal of energy. In addition, the air flow must be heated before flowing through the Sorptionsrads to accommodate a sufficient amount of water can. The efficiency of recovering water from ambient air is dictated by the energy-intensive cooling and heating of the airflow.

The present invention is therefore based on the object to provide a water extraction device in which can be dispensed with an energy-intensive cooling of the air flow and still the most efficient water extraction can be done from an input air flow.

The object is achieved by the water extraction device described at the outset, which according to the invention is designed so that it has a compressor for compressing the moist air flow, which is arranged between the sorption element and the first condensation stage.

By compressing the moist air flow laden with the water absorbed from the sorption element, the absolute humidity of the moist air flow is increased and thereby the subsequent removal of water in the first condensation stage is promoted. The absolute humidity of the wet air flow is defined as the ratio of the water vapor mass actually contained in an air volume unit to the volume. The compression also affects the relative humidity of the wet air flow, which is defined as the ratio of the absolute humidity to the maximum humidity of the humid air flow. Furthermore, the condensation also changes the dew point temperature of the moist air flow. By a suitable specification of the amount of air of the moist air flow and its compression before the first condensation stage, a very energy-efficient extraction of water from the ambient air can be achieved.

The inlet air stream can be sucked directly from the ambient air. The input air stream may also be from an exhaust air stream or from an exhaust air stream of a ventilation system or an air conditioning system. It is also possible that the ambient air or an exhaust air or exhaust air flow is conditioned in advance in a suitable manner, before the input air flow generated therefrom is supplied to the water extraction device.

The moist air flow can be heated to a comparatively high temperature before it flows through the sorption element. This is advantageous because the damp air flow at an elevated temperature can absorb more water from the sorbent element. According to the invention, the sorption element may be a sorption wheel. In the sorption edge, a solid which promotes the adsorption of water can be arranged. But it may also be another device that allows to absorb water from the inlet air stream and deliver it to the damp air flow. For example, trickle plants are known in which a suitable liquid trickles down on a surface or on a structure and the input airflow bypasses the surface or structure so that water from the input airflow is absorbed by the trickling fluid. The wet air stream, which also flows through the sorption element, then absorbs sorbed water from the sorption element and transports it to the first condensation stage.

The moist air flow, according to an advantageous embodiment of the inventive concept in the passage through the sorption to a smaller mass air flow than the input air flow, preferably less than 50% and optionally less than 20% of the mass air flow of the input air flow. In this way, a higher relative humidity of the humid air flow compared to the relative humidity of the input stream can be achieved, whereby the water extraction is favored.

The compressor arranged between the sorption element and the first condensation stage serves to compress the warm moist air flow before the first condensation stage. According to the invention, the compressor may be a compressor driven by an internal combustion engine or by an electric motor. For the purposes of the present invention, compressor means any compressor with which a compression of an air flow can be effected. A compressor can also be operated, for example, by heat energy decoupled from the water extraction device or by solar energy.

From the compressor exits the compressed moist air flow. In the first condensation stage heat can be removed from the humid air flow and removed by a heat exchanger. The dissipated heat may optionally be supplied to the moist air flow at another point in order to heat the moist air flow, for example, before flowing through the sorption. If necessary, the first condensation stage can even take up water from the moist air flow without requiring energy-intensive cooling of the moist air flow to a temperature well below the ambient temperature.

According to an embodiment of the inventive concept, it is possible that the first condensation stage is cooled by a flow of cooling fluid. If appropriate, the cooling fluid flow can be obtained from the ambient air, so that only one flow has to be generated and a separate cooling with the aid of a coolant or additional cooling energy can be dispensed with. The cooling fluid stream may also include a liquid or gaseous heat transfer medium that allows for efficient cooling.

According to the invention, the water extraction device may comprise at least one turbomachine which causes or supports a flow movement of the input air flow, the wet air flow and / or the cooling fluid flow. In the turbomachine according to a preferred embodiment of the invention is a fan or a turbine.

The heat supply device of the water extraction device can be designed according to the invention as a heating device. The heating device can be embodied, for example, as an electrical heating device with a heating conductor, as a combustion device or as another heating device. The heater can also be powered by solar energy. Alternatively or in addition to a heating device, the heat supply device may be formed as a supply channel through which heat can be supplied to the damp air flow, which is generated for example at another area within the water extraction device and coupled into the supply channel. The heat can be transmitted for example by means of a heat transfer medium. According to the invention, it is possible that the moist air flow externally generated heating air or warm exhaust air is supplied. Furthermore, according to the invention, the heat supply device can be designed as a heat conducting element, which can be connected to an external heat source. The external heat source can be, for example, a solar collector or another external heat source.

By means of the water extraction device, a stationarily operable and / or mobile water extraction from the atmosphere or from the ambient air or from an already conditioned in some way exhaust or exhaust air flow can be operated. In particular, a water extraction from the exhaust air of air conditioning or water recovery in industrial processes or dehumidification of industrial air streams is possible. Furthermore, a minimization of water consumption in power generation or in water-consuming processes can be achieved, as used for example in the irrigation in greenhouses. There are also other applications conceivable in which it depends on an energy-efficient extraction of water from an amount of air.

It is particularly preferred if the damp air flow is circulated through the water extraction device. It is possible according to the invention that the moist air flow is conducted in a closed circuit. Here, the moist air flow no additional air flow is supplied from the outside and the humid air flow can not leave the closed circuit. This allows suitable and precise conditioning of the humid air flow in each section within the closed circuit.

Alternatively, it is possible that the air flow is conducted in an open circuit. Here, the moist air flow, an air flow can be supplied from the outside or a part of the wet air flow are diverted from the circuit. It is also possible according to an embodiment of the inventive concept that the damp air flow discharged after a water extraction and a new humid air flow is sucked.

The first condensation stage is preferably in heat-conductive connection with a heating section of the moist air flow in front of the heat supply device, wherein the heating section of the moist air flow of the heat supply device precedes in the flow direction. During the condensation of water from the moist air flow, condensation heat is generated in the first condensation stage. Conveniently, it is provided that in a condensation in the first condensation stage, the heat of condensation removed during cooling of the moist air flow for re-heating of the moist air flow before it is fed to the sorption element is available. By supplying the resulting heat to the heating section of the moist air stream can be heated before a subsequent flow through the sorption. Consequently, at least a portion of the energy used for compression and subsequent condensation of the moist air flow can continue to be used.

Optionally, furthermore, the first condensation stage can additionally be cooled, which favors the condensation process on the condenser of the first condensation stage.

By way of example, the heating section may be a section of a pipe or a guide channel through which the moist air flow passes. According to one embodiment of the inventive idea, the first condensation stage can be in direct communication with the heating section, or the heating section can be guided past or passed through the condensation stage. The first condensation stage can also be thermally conductively connected to the heating section via a thermally conductive element.

It is advantageous if the water extraction device has a second condensation stage with a condenser, wherein the second condensation stage is arranged so that the moist air flow flows through it in the flow direction after the first condensation stage. By the second condensation stage water can be recovered from the damp air flow again, which has not yet been separated from the condenser of the first condensation stage from the moist air flow. Another condensation process is possible because the humid air flow is already noticeably cooled when reaching the second condensation stage in comparison to the damp air flow before the first condensation stage, which favors the condensation process.

It is possible according to the invention for the second condensation stage to have a passage for a cooling fluid flow for cooling the second condensation stage in order to support a condensation process in the second condensation stage. The cooling fluid stream cools the second condensation stage. As a result, a further cooling of the moist air flow occurs, which is indeed isolated from the cooling fluid flow, but is indirectly cooled via the second condensation stage. This in turn favors the condensation process in the second condensation stage. The cooling fluid flow can lead to pre-cooled air. However, the air guided by the cooling fluid stream may also be uncooled ambient air, provided that the temperature of the moist air flow at this time is even higher than the temperature of the ambient air. As a cooling fluid, for example, water or any other suitable heat transfer medium can be used.

According to a particular embodiment of the invention, the water extraction device on an expansion machine, which is arranged so that the moist air flow flows through the expansion machine after the second condensation stage. As a result, the moist air flow is relaxed. Alternatively, however, it is also possible that no expansion machine is provided in the water extraction device and the compressed moist air flow can expand again in a different manner. If the moist air flow is not conducted in a closed circuit, the compressed humid air flow can be ejected from the water extraction device after the water extraction, even in a compressed state.

Preferably, the water extraction device has a third condensation stage with a condenser, wherein the third condensation stage is arranged so that the moist air flow flows through it after the expansion machine. During the decompression of the moist air flow, this cools further in addition to the cooling of the moist air flow in the first and in the second condensation stage. In the associated Sorptionsvorgängen each heat of condensation was released, which was delivered to the first and second condensation stage. Due to the expansion of the moist air flow before the third condensation stage, its relative humidity increases again, so that the humid air flow can still be deprived of energy by the third condensation stage in an energy-efficient manner.

According to a preferred embodiment of the invention, the water extraction device has a heat-emitting element which is arranged so that the moist air flow can be heated with the heat-emitting element, after the moist air flow has passed through at least one condensation stage. In a particularly advantageous manner may be additionally provided that the heat-emitting element is thermally conductively connected to a arranged on the input air flow upstream of the sorbent heat receiving element, which is arranged so that the input air flow is cooled and the moist air flow is heated. Water conducted through the inlet air flow can be absorbed better by the sorption element the lower the temperature of the inlet air flow is. Therefore, it is advantageous if the input air flow is cooled before it flows through the sorption.

A corresponding cooling can be effected according to the invention by the heat-emitting element and the heat-absorbing element, which according to the invention can be connected to one another via a thermally conductive element. Preferably, the heat-emitting element is arranged downstream of the third condensation stage in the flow direction of the moist air flow.

A particularly energy-efficient embodiment of the water extraction device according to the invention can be made possible by the fact that the compressor and the expansion machine are in operative connection, so that the expansion energy that becomes useful in an expansion of the compressed wet air flow can be used in an energy-efficient manner for compressing the moist air flow with the compressor. For example, the compressor and the expansion machine each have a turbine assembly, which are interconnected by a common shaft.

The present invention further relates to a method of recovering water from an input air stream wherein water is sorbed from the input air stream in a sorption step, the water subsequently being delivered to a wet air stream, the moist air stream being heated in a heating step prior to discharging the water to the wet air stream, so that the delivery of water to the moist air flow is improved, and wherein in a first condensation step water is obtained from the damp air flow. According to the humid air stream is compressed after discharge of the water to the moist air flow and before the first condensation step with a compressor. The compression also causes a rise in the temperature of the moist air flow, but the relative humidity of the moist air flow can be greatly increased by the compression, so that water can be separated when flowing through the first condensation stage.

Preferably, the moist air flow is guided in an optionally closed circuit. However, it is also possible to conduct the damp air flow in an open circuit or sucked before the sorption step and remove after a water extraction from the damp air flow again.

It is advantageous if heat obtained in the first condensation step is supplied to the damp air flow immediately before the moist air flow is heated in the heating step, so that heat used in the first condensation step is used to heat the moist air flow.

It is further preferred if water is obtained from the moist air flow after the first condensation step in a second condensation step. It is possible according to the invention for a cooling fluid flow to be supplied to a capacitor assigned to the second condensation step in the second condensation step in order to assist a condensation process in the second condensation step.

According to a particular embodiment of the method, the moist air stream is expanded after the second condensation step. Preferably, water is recovered from the damp air stream after expansion in a third condensation step. According to another possible embodiment of the method, a heat flow is taken from the inlet air flow and supplied to the moist air flow after the moist air flow has been subjected to at least one condensation step, so that the inlet air flow is cooled and the moist air flow is heated. Preferably, the heat flow is the moist air flow supplied only after the moist air flow has been subjected to the first and the second condensation step. Most preferably, the heat flow is the moist air flow supplied only after the damp air flow has been subjected to the first, second and third condensation step.

According to an optional embodiment of the inventive concept, it is provided that the moist air flow is removed after the second condensation step or optionally after the third condensation step and a new moist air flow is sucked in from the inlet air stream or from a moist air stream reservoir. After the second or third condensation step, a considerable proportion of entrained water has already been taken from the damp air flow and the moist air flow cooled so that the water content in the ambient air or in the exhaust air or exhaust air used by the air treatment plants for the input air flow can be higher. Also, the temperature of the ambient air or the exhaust air, or exhaust air may be higher than the temperature of the cooled moist air flow. Depending on the particular process conditions, it may then be better to dissipate the spent moist air flow and to suck in a new moist air flow, which is then fed to the sorption element and subsequently compressed. The newly aspirated damp air flow can be additionally heated before being fed to the sorption element.

The method can be carried out by means of the water extraction device described above. However, the method according to the invention can also be carried out in other ways or with other structural means or apparatuses.

• 1 eine schematische Darstellung einer erfindungsgemäßen Wassergewinnungsvorrichtung,
• 2 eine schematische Darstellung eines erfindungsgemäßen Verfahrensablaufs zur Wassergewinnung,
• 3 eine schematische Darstellung einer abweichend zu 1 ausgestalteten erfindungsgemäßen Wassergewinnungsvorrichtung, und
• 4 eine schematische Darstellung einer wiederum abweichend augestalteten erfindungsgemäßen Wassergewinnungsvorrichtung.

Further advantageous embodiments of the invention are illustrated in the drawings. Showing:

• 1 a schematic representation of a water extraction device according to the invention,
• 2 a schematic representation of a process sequence according to the invention for the production of water,
• 3 a schematic representation of a deviating to 1 designed water extraction device according to the invention, and
• 4 a schematic representation of a turn deviating designed water extraction device according to the invention.

1 shows a schematic representation of a water extraction device according to the invention 1 , The water extraction device 1 has a first feedthrough tube 2 on, that has an input airflow 3 leads, which is symbolized by an arrow. The inlet airflow 3 feeds from ambient air 4 that the water extraction device 1 surrounds. The inlet airflow 3 could be fed differently from the illustrated embodiment, for example, from the exhaust air or exhaust air of a ventilation system or air conditioning system.

The inlet airflow 3 becomes within the water extraction device 1 through a section of a sorption wheel 5 passed. The inlet airflow 3 flows through the sorption wheel 5 , wherein adsorption of water from the input air stream 3 not shown structures within the Sorptionsrads 5 takes place. The sorption wheel 5 is rotatably mounted and driven by a motor. The sorption wheel 5 located during operation of the water extraction device 1 in rotation, so that the loaded with adsorbed water section of the sorption 5 is further rotated and new sections of sorption 5 from the inlet airflow 3 be flowed through and loaded with water. In place of the Soprtionsrads 5 It is also possible to use a deviating absorption device or, in general, a sorption device.

The water extraction device 1 has a second guide channel 6 on, the a humid air flow 7 leads, which is also symbolized by an arrow. The humid air flow 7 also flows through the sorption wheel 5 , wherein the input air flow 3 and the moist air flow 7 separated from each other by the sorption wheel 5 be guided. The humid air flow 7 is doing so through the sorption 5 led that from the input air flow 3 already flowed through and loaded with water section of the Sorptionsrads 5 The adsorbed water as completely as possible then to the then flowing moist air flow 7 gives up again.

The humid air flow 7 is through a heat supply device 8th warmed up before getting the sorption wheel 5 flows through. The heat supply device 8th is through a heat transfer element 9 and a heat conducting element 10 educated. The heat-conducting element 10 is with an external heat source 11 thermally conductive connected. The humid air flow 7 flows through before its supply to the Sorptionsrad 5 the heat transfer element 9 and thus can heat from the heat transfer element 9 take up. The heated humid air flow 7 flows through the sorption wheel 5 and takes water from the sorption wheel via a desorption process 5 on.

The water extraction device 1 has a first condensation stage 12 on, which contains a capacitor, not shown. By means of the first condensation stage 12 can remove water from the humid air stream 7 be won.

Between the first condensation stage 12 and the sorption wheel 5 is a compressor 13 arranged. The compressor 13 serves to damp air flow 7 to condense. By the compression of the Moist air flow 7 the dew point temperature of the wet air stream laden with water decreases. Thus, from the damp air flow 7 in the subsequent first condensation stage 12 efficiently water are separated.

The first condensation stage 12 is heat transferring with a heating section 14 of the moist airflow 7 connected in front of the heat transfer element 9 is arranged. Thus, the humid air flow 7 in addition, be heated before passing the heat transfer element 9 flows through.

The second guide channel 6 guides the damp air flow 7 after the first condensation stage 12 a subsequently arranged second condensation stage 15 to. The second condensation stage 15 In addition, a cooling fluid flow 16 through a cooling channel 17 fed. The cooling fluid flow 16 cools the second condensation stage 15 so that a condensation process at the second condensation stage 15 is improved.

The second condensation stage 15 Close an expansion machine 18 and a third condensation stage 19 at. Through the expansion machine 18 becomes the humid air flow 7 relaxed. This cools the humid air flow 7 which causes a condensation process in the third condensation stage 19 is improved.

The humid air flow 7 is through the second guide channel 6 after flowing through the third condensation stage 19 a heat-emitting element 20 a heat transfer device supplied. The heat-dissipating element 20 is via a heat transfer device 21 with a heat receiving element 22 connected, that of the input air flow 3 is flowed through. The incoming incoming air flow 3 is from the heat receiving element 22 the heat transfer device heat extracted and the input air flow 3 cooled thereby, during the damp air flow 7 through the heat-dissipating element 20 Heat is supplied and the damp air flow 7 is heated by it. By cooling the inlet airflow 3 is the adsorption of water through the sorption wheel 5 from the inlet airflow 3 improved. The case the input air flow 3 extracted heat energy is through the heat transfer device for heating the moist air flow 7 before re-passing through the sorption wheel 5 used.

The second guide channel 6 guides the damp air flow 7 within the water extraction device 1 in a closed cycle.

2 shows a schematic flow diagram of a method for water extraction according to the present invention. This is done in a sorption step 23 Water from an inlet airflow 3 sorbed. This can according to the invention by means of a Sorptionsrads 5 respectively. In a heating step 24 becomes a humid air flow 7 heated, including the damp air flow 7 According to the invention, heat from an external heat source 11 can be supplied. Then the sorbed water is added to the heated moist air stream 7 in a dispensing step 25 issued. Subsequently, the moist air flow 7 in a compression step 26 compacted. This can according to the invention by means of a compressor 13 respectively.

Finally, in a first condensation step 27 Water from the humid air stream 7 won. According to the invention this can be done by means of a capacitor. After the first condensation step 27 Optionally additional second and third or further condensation steps 27 ' , 27 '' are passed through one after the other.

In 3 is an example of a different embodiment of in 1 illustrated water extraction device according to the invention 1 shown. The matching features are not discussed in detail below. The inlet airflow 3 is through a cooling device 28 cooled, not with other components of the water extraction device 1 communicates. The compressor 13 and the expansion machine 18 are about a common wave 29 interconnected, allowing energy-efficient operation of the compressor and the expansion machine 18 is possible. It would also be possible to use the compressor 13 and the expansion machine 18 not to be connected by a mechanical operative connection with each other, but to provide an exclusively energy-transmitting connection.

In 4 is an example of a different embodiment of a water extraction device according to the invention 1 shown. The humid air flow 7 is in contrast to the in 1 and 3 shown embodiments are not performed in a closed circuit, but from the ambient air 4 sucked. The humid air flow 7 could also be from a moist air reservoir 30 be sucked, in which preconditioned moist air is collected and stored. The sucked damp air flow 7 is first the heat-emitting element 20 supplied to the heat transfer device. The incoming incoming air flow 3 is from the heat receiving element 22 the heat transfer device heat extracted and the input air flow 3 cooled thereby, during the damp air flow 7 through the heat-dissipating element 20 warmth is supplied, so that the sucked moist air flow 7 is heated. Subsequently, the moist air flow 7 in the heating section 14 from the first condensation stage 14 heated, and subsequently from the heat supply device 8th heated, that of the heat transfer element 9 and the heat conducting element 10 is formed with the external heat source 11 thermally conductive is connected.

The thus preheated moist air flow 7 as well as from the ambient air 4 intake intake air flow 3 passed through the sorption, which as a Rieselsorptionsanlage 31 is trained. In the Rieselsorptionsanlage 31 trickles an absorption liquid down a trickle structure. The incoming air stream flowing past the trickle structure 3 releases water to the absorption liquid. The humid air flow 7 flows through the Rieselsorptionanlage 31 and absorbs absorbed water on the descending absorption liquid.

Subsequently, the moist air flow 7 in the compressor 13 then compressed in the first condensation stage 12 Water from the humid air stream 7 to withdraw. In the second condensation stage 15 passing through the cooling fluid stream 16 is cooled, water is also the humid air flow 7 withdrawn. After an expansion of the moist airflow 7 in the expansion machine 18 is in a third condensation stage 19 again deprived of water. The humid air flow 7 is in the condensation stages 12 . 15 and 19 successively dehumidified and cooled. The third condensing substance 19 dehumidified moist airflow 7 gets into the ambient air 4 dissipated.

LIST OF REFERENCE NUMBERS

1.

Water extraction device

Second

First guide channel

Third

Input airflow

4th

ambient air

5th

sorption

6th

Second guide channel

7th

Moist air flow

8th.

Heat supply means

9th

Heat dissipation element

10th

thermally conductive element

11th

External heat source

12th

First condensation stage

13th

compressor

14th

heating section

15th

Second condensation stage

16th

Cooling fluid flow

17th

cooling channel

18th

expander

19th

Third condensation stage

20th

Heat dissipation element

21st

Heat transfer device

22nd

Heat absorption element

23rd

sorption

24th

heating step

25th

dispensing step

26th

compaction step

27th

First condensation step

27 '.

Second condensation step

27 ".

Third condensation step

28th

cooling device

29th

wave

30th

Moist air reservoir

31st

Rieselsorptionsanlage

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 7251945 B2 [0002]

Claims (20)

A water extraction device (1) for recovering water from an input air stream (3), comprising a sorption element for sorbing water from the input air stream (3) and discharging water to a wet air stream (7) through the water extraction device (1) Sorption element is arranged so that it can be traversed by the inlet air flow (3) and the moist air flow (7), - with a heat supply means (8) for heating the moist air flow (7) before it flows through the sorption, so that the delivery of water the humid air flow (7) is improved, and - with a first condensation stage (12) having a condenser for recovering water from the moist air flow (7), characterized in that the water extraction device (1) comprises a compressor (13) for compressing the Moist air flow (7), which is arranged between the sorption element and the first condensation stage (12). Water extraction device (1) after Claim 1 , characterized in that the moist air flow (7) in the passage through the sorption (5) has a smaller mass air flow than the input air flow (3), preferably less than 50% and optionally less than 20% of the mass air flow of the input air flow. Water extraction device (1) after Claim 1 or Claim 2 , characterized in that the moist air flow (7) through the water extraction device (1) is guided in a closed circuit. Water extraction device (1) according to one of the preceding claims, characterized in that the first condensation stage (12) with a heating section (14) of the moist air flow (7) before the heat supply means (8) in thermally conductive connection, wherein the heating section (14) of the moist air flow (7) the heat supply device (8) in the flow direction, so that in a condensation in the first condensation stage (12) resulting heat for heating the moist air flow (7) is available. Water extraction device (1) according to one of the preceding claims, characterized in that the water extraction device (1) comprises a second condensation stage (15) with a condenser, wherein the second condensation stage (15) is arranged so that the moist air flow (7) in the flow direction flows through the first condensation stage (12). Water extraction device (1) after Claim 5 , characterized in that the second condensation stage (15) has a passage for a cooling fluid flow (16) for cooling the second condensation stage (15) to assist a condensation process in the second condensation stage (15). Water extraction device (1) according to one of the preceding claims, characterized in that the water extraction device (1) comprises an expansion machine (18) arranged so that the moist air flow (7) passes through the expansion machine (18) after the second condensation stage (15) , Water extraction device (1) after Claim 7 , characterized in that the water extraction device (1) comprises a third condensation stage (19) with a condenser, wherein the third condensation stage (19) is arranged so that the moist air flow (7) flows through it after the expansion machine (18). Water extraction device (1) according to any one of the preceding claims, characterized in that the water extraction device (1) comprises a heat delivery element (20) arranged so that the moist air flow (7) can be heated with the heat delivery element (20) after the moist air flow (7) has passed through at least one condensation stage. Water extraction device (1) after Claim 9 , characterized in that the heat-dissipating element (20) is thermally conductively connected to a heat-absorbing element (22) arranged upstream of the sorption element at the inlet air flow (3) and arranged so that the inlet air flow (3) is cooled by the heat-absorbing element (22) and the moist air flow (7) with the heat-emitting element (20) is heated. Water extraction device (1) according to one of the preceding claims and Claim 7 , characterized in that the compressor (13) and the expansion machine (18) are operatively connected to each other, so that in an expansion of the compressed moist air flow (7) become usable expansion energy energy efficient for the compression of the moist air flow (7) with the compressor (13) can be. Method for obtaining water from an inlet air stream (3), - wherein water from the inlet air stream (3) is sorbed in a sorption step (23), - the water is then discharged to a moist air flow (7), - wherein the moist air flow (7) is heated to the moist air flow (7) in a heating step (24) before delivery of the water, so that the delivery of water to the moist air flow (7) is improved, and wherein in a first condensation step (27) water is obtained from the moist air flow (7), characterized in that the moist air flow (7) after discharge of the water to the moist air flow (7) and before the first condensation step (27) is compressed with a compressor (13). Method according to Claim 12 , characterized in that the moist air flow (7) is guided in a closed circuit. Method according to Claim 12 or Claim 13 , characterized in that in the first condensation step (27) resulting heat the moist air flow (7) is supplied immediately before the moist air flow (7) is heated in the heating step (24), so that in the first condensation step (27) resulting heat for heating the damp air flow (7) is used. Method according to one of Claims 12 to 14 , characterized in that from the moist air flow (7) after the first condensation step (27) in a second condensation step (27 ') water is recovered. Method according to Claim 15 characterized in that in the second condensation step (27 '), a cooling fluid stream (16) is supplied to a condenser associated with the second condensation step (27') to assist a condensation process in the second condensation step (27 '). Method according to one of Claims 12 to 16 , characterized in that the moist air flow (7) after the second condensation step (27 ') is relaxed Method according to Claim 17 , characterized in that from the moist air flow (7) after the expansion in a third condensation step (27 '') water is recovered. Method according to one of Claims 12 to 18 characterized in that heat is transferred from the input air stream (3) into the wet air stream (7) after the wet air stream (7) has undergone at least one condensation step so that the input air stream (3) is cooled and the moist air stream (7) is heated. Method according to one of Claims 15 to 19 , characterized in that the moist air flow (7) after the second condensation step (27 ') or optionally after the third condensation step (27'') dissipated and a new moist air flow (7) from the input air stream (3) or from a Feuchtluftstromreservoir (30) is sucked.

Images